> clauses against hosting your own website on residential providers

If their standard residential Internet packages don't offer truly static IP addresses, then it at least makes nominal sense to say: if you want to host your own website from your home, you pay some annual fee for a static IP that is not part of normal residential provision of service. But that can also quickly twist into charging exorbitant rates or pushing people hosting personal websites on their own hardware to pay for business plans they don't truly need.